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De-k swap not running correctly (lean or rich)

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Old Dec 27, 2015 | 07:38 PM
  #1  
PeterQ14's Avatar
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De-k swap not running correctly (lean or rich)

Hey guys I did a De-k swap in my 99 Maxima and Im having issues with it running lean and running rich. Any ideas?
Old Jan 1, 2016 | 07:28 PM
  #2  
1998Maxima's Avatar
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Joined: Jul 2011
Posts: 27
From: RhodeIsland
The reason for that is mainly the injectors in the DEK engine. they are bigger than the ones in the old DE engine.

I suggest getting a tune for it so you wont be running too rich or too lean.
Its any one of those VAFC2 VTEC control air/flow fuel controllers, emanage, Apexi, etc or any other brands.

Thats unless you already have one
Old Jan 1, 2016 | 08:09 PM
  #3  
schmellyfart's Avatar
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From: AZ
You probably have a vacuum leak if its going back and forth between running lean and rich.

The dek injectors aren't that much bigger in the grand scheme of things, so the ECU does a pretty good job of compensating in regular driving. Once you go heavy load/full throttle you will run rich and that is where the tuning devices mentioned earlier come into play.
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